Dilema

So ... I've been invited to somebody else's Christmas Party. What should I wear?

For my own work Christmas parties I am inclined to have the Christmas logo t-shirt, bells in my ears and tinsel and baubles in my hair and/or round my neck. Potentially also on my shoes.

Probably I should be a little more respectable at somebody else's work Christmas Party though ey?

I shall have to go shopping.